Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with ananimated graphical user interface showing a first image of our newdesign;

FIG. 2 is a second image thereof;

FIG. 3 is a third image thereof; and,

FIG. 4 is a fourth image thereof.

The broken lines in the figures represented by dashed broken lines anddotted broken lines illustrate portions of a graphical user interface,and form no part of the claimed design.

The appearance of the animated images sequentially transitions betweenthe images shown in FIGS. 1-4. The process or period in which one imagetransitions to another forms no part of the claimed design.

CLAIM I claim the ornamental design for a display screen or portionthereof with an animated graphical user interface, as shown anddescribed.